Window corner key



FIG. 1 is a front elevation view of a window corner key showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a cross-sectional view taken through FIG. 1 along the line 6--6. 

The ornamental design for a window corner key, as shown and described. 